ADS7812U

Analog To Digital Converters (ADC) Overview

The ADS7812U is a low-power, single +5V supply, 12-bit sampling analog-to-digital converter manufactured by Texas Instruments. It integrates a capacitor-based successive approximation register (SAR) A/D with a sample/hold circuit, clock, reference, and serial data interface. The device supports multiple input ranges including ±10V, ±5V, 0V to 10V, and 0.5V to 4.5V, with an optional high-impedance range of 0.3V to 2.8V. It operates at a throughput rate of 40kHz over the –40°C to +85°C temperature range. Key electrical specifications include a maximum conversion time of 20µs, a power dissipation of 35mW, and a minimum Signal-to-(Noise+Distortion) ratio of 72dB.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with ±0.5LSB maximum Integral Linearity Error (INL) and Differential Linearity Error (DNL).
• Flexible SPI-compatible serial interface supporting internal or external DATACLK synchronization.
• Configurable for various input ranges via resistor connections, including ±10V, ±5V, and unipolar options.
• Low power consumption of 35mW during operation with a 50µW power-down mode.

Analog To Digital Converters (ADC) Applications

• Data acquisition systems
• Industrial control applications
• Test equipment
• Digital signal processing

Analog To Digital Converters (ADC) Procurement Notes

Verify the package designation 'SO-16' corresponds to the specific SOIC-16 variant required for the design. Confirm whether the standard grade (±1 LSB INL/DNL) or the B-grade (±0.5 LSB INL/DNL, higher SINAD) is needed, as these are distinct part numbers within the same family. Ensure the ordering suffix matches the desired packaging quantity, such as tubes for standard quantities or tape and reel for automated assembly.

Analog To Digital Converters (ADC) Selection Notes

Select the ADS7812U when a 12-bit SAR ADC with a single +5V supply is required. This model is suitable for designs needing multiple configurable analog input ranges without external scaling circuits. Consider the ADS7813 if 16-bit resolution is necessary, as it is pin-compatible but has a longer conversion time. Ensure the system can accommodate the 40kHz maximum sampling rate and the specific timing requirements for the CONV and DATACLK signals.

Analog To Digital Converters (ADC) Part Context

The ADS7812U belongs to the ADS7812 series of low-power serial ADCs from Texas Instruments. It is designed as a cost-effective solution for general-purpose data acquisition tasks. The 'U' suffix indicates the SO-16 surface-mount package. It shares architectural similarities with other members of the ADS78xx family but is distinguished by its 12-bit resolution and specific input range configuration capabilities.

Analog To Digital Converters (ADC) Replacement Considerations

The ADS7813 is pin-compatible but offers 16-bit resolution and a slower conversion speed. For direct replacement in terms of package and function, verify if the ADS7812PB (DIP-16) or ADS7812UB (SO-16, B-grade) meets the linearity and SNR requirements. No other direct cross-model replacements are documented in the provided source material.